amd-xgbe: Fix error path in xgbe_mod_init()

In xgbe_mod_init(), we should do cleanup if some error occurs

Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: efbaa828 ("amd-xgbe: Add support to handle device renaming")
Fixes: 47f164de

 ("amd-xgbe: Add PCI device support")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>